Dyeing vegetable fibers.



and 1 or 2 mols. cresol; diamin 1 or 29111018.lTlGiiZIPllQllYlQIlB 0r follows: Cotton which has JOSEPH TURNER AND HARRY READ HOLLIDAY,& SONS, LTD,

DEAN, OF HUDDERSFIELD, ENG-LAND, ASSIGNORS T0 OF HUDDERSFIELD, ENGLAND.

DYEING VEGETABLE FIBERS.

No Drawing.

Specification of Letters Patent.

Patented Au at, 1914.

Application filed. March 18, 1913. Serial No. 755,103.

To all whom it may concern Be it known that we, Josnrr-r TURNER and HARRY DEAN, subjects of King George V of Great Britain, and residents of Huddersfield, in the county of invented certain new and useful Improvements in Dyeing Vegetable Fibers, of which the following is a specification:

Our invention relates to a new and useful method for dyeing cotton fibers which have been previously dyed with sulfur colors, and to the new and useful products produced thereby,

We have discovered that cotton which has been dyed with sulfur-colors can be aftertreated with certain amino compounds, and in such a manner that the produced results have many valuable commercial advantages over the untreated or original dyeings.

Our process, in general, consists in treat inp; cotton dyed with sulfur 0010 's with certain amino compounds in the presence of an oxidizing agent. Among the amino compounds which we have employed for the production of these new and valuable results are: paraphenylenedia-min; p-amidopoxydiphenylamin; paramidophenol; orthoamidophenol; homologues of the fore1nentioned, and the followingcondensation proclucts which are described in English Patent No. 15008, 1908, viz: paraphenylene diamin and 1 mol. naphthol; paraphenylene diamin and 2 mols. naphthol;paraphenylene diamin and 1 mol. phenol; paraphenylene diainin and 2 mols. phenol; para-phenylene diamin paraphenylene toluylenediamin. In order to produce varied results the above amino compounds may be used singly or in combination with each other. i p

One method of following our process is as been dyed with 6% of sulfur color, such as cross dye black B. is worked in a bath containing 2% paraphenylenediamin, 20 parts of 'water,

York, England, have 8% acetic acid 1% bichromate of soda, for a few minutes in the cold and then gradually raised to l0 (3. during about half an: hour. The operation may also be conducted in the cold throughout or the temperature may be raised to boilingpoint.

\Ve do not limit ourselves to the exact proportions given above, all of which may be varied without going beyond the scope of our invention.

The herein described method of treatment produces results possessing decidedly differout and more valuable properties than those of the original dyed cotton, among which are their increased intensity and beauty of shade and their improved fastness to light a nd millin I-laving thus described our invention, what we claim is:

1.. The process of treatingdyed cotton which comprises subjecting cotton previously dyed with sulfur colors to a bath containing an oxidizing agent and an amino compound.

2. The process of treating dyed cotton which comprises subjecting cotton previously dyed with sulfur colors to an acid bath containing an oxidizing agent and an amino compound.

The process of treating); dyed cotton which comprises subjecting cotton previously dyed with sulfur colors to a bath containing an oxidizing agent and a mixture of amino compounds.

4. The process of treating dyed cotton which comprises subjecting cotton previously dyed with sulfur colors to an acid bath containing bichromate of soda and an amino compound.

Signed at Huddersfield in the county of York, England March, A. D. 1913.

JOSEPH TURNER. HARRY DEAN. Witnesses:

FREDERICK Srnns BAINES, VIo'ron I-l. Gonn'rnonrn.

Copies of this patent may be obtained tor five cents each, by addressing the Commissioner of Yatents.

a Washington, D. 0. i 

